Improvement in gearings



UNITED STATES PATENT OFFICE.

FRANK EMMERIGH, OF NEW YORK, N. Y.

IMPROVEMENT IN GEARINGS.

Specification forming part of Letters Patent No. 140,690, dated July 8,1873; application filed June 5, 1873.

vTo alt whom it may concern:

Beit known that I, FRANK EMMERICH, of the city, county and State of NewYork, have invented an Improvement in Gearing, of which the following isa specification:

Figure 1 is a face view, partly in section, of my improved gearing. Fig.2 is an edge view of the same.

Similar letters of reference indicate corresponding parts.

The object of this invention is to produce a new gearing, by which acontinuous bearing of the teeth of one wheel upon those of the other canbe obtained, and all back-lash or loss ot' motion during reversingavoided.

This invention consists in making each Wheel of two or more tootheddisks, whose teeth are constructed on the same pitch-1ine, but withditlerent pitches, so that where two or more such disks of twogear-wheels mesh into each other, not only the continuous bearing isobtained, but also all loss of motion or back-lash during reversionavoided. In fact,

` under this construction, two disks for each wheel will be fully aseffective as three or more when constructed on the principles ofordinary step-gearin g.

In the accompanying drawing, the letter A represents one and B the otherof two shafts to be connected by gearing. Upon the shaft A is mountedthe gear-wheel C, and upon the shaft B the pinion or gear-wheel D. The

wheel C is composed of two toothed disks or gear-wheels, a and b, andthe wheel or pinion D of two toothed disks or gear-wheels d and e, asshown in Fig 2, the said disks being s0 placed that a gears into d and binto e. The pitch-lines of the wheels a b are alike, as are also thoseof d c, but the pitches of the teeth a b vary, and so do those of thewheels d e. This makes the teeth of a differ in size and number fromthose formed on the wheel b, and consequently also an equal variationexists between the teeth of d and e. The varying size, thickness, andnumber of teeth produces such a disposal of contact surfaces thatcontinuous bearings will be obtained when these wheels are in gear, andall back-lash prevented, as aforementioned. The disks a and b may beconnected by a set-screw, f, passing through a slot of one of the disks,so that they may be properly adjusted with reference to the disposal oftheir teeth whenever necessary.

I claim as my invention, and desire to secure by Letters Patent- Thegear-wheels C D, constructed each of two or more toothed disks, theteeth of each pair being formed on the same pitch-line, but

with different pitches, substantially as described.

FRANK EMMERICH. Witnesses:

FRED. HAYNEs,

MICHAEL RYAN`

